British Prime Minister David Cameron has been challenged by a group of over 50 lawmakers from his Conservative Party who are prepared to join a campaign backing Britain’s exit from the European Union unless he achieves radical changes in the bloc.

The lawmakers yesterdaylaunched a new political group called Conservatives for Britain (CfB), which will support Cameron’s bid for reform while urging an end to EU membership unless significant changes are achieved.

Cameron is attempting to persuade European leaders to back UK demands for reform before holding an in-out referendum on Britain’s EU membership. He has promised the vote by the end of 2017.

“We wish David Cameron every success, but unless senior EU officials awake to the possibility that one of the EU’s largest members is serious about a fundamental change in our relationship, our recommendation to British voters seems likely to be exit,” Conservative lawmaker Steve Baker said.

Britain’s PM David Cameron wants to restrict migrants’ access to British welfare

Cameron wants to restrict EU migrants’ access to British welfare, improve the single market and win safeguards to ensure countries outside the euro zone are not put at a disadvantage by greater integration.

Foreign Secretary Philip Hammond said yesterday the UK government was seeking treaty change to protect its reforms, and that he believed the renegotiation could fix Britain’s relationship with the EU.

“There was always going to be a group of our colleagues who wanted to come out of the EU come what may,” Hammond said .

“That is not where the government is... we’re clear that the EU isn’t working as it is at the moment, it’s not fit for the 21st century, but we think it’s fixable.”

Baker said CfB had already signed more than 50 lawmakers (MPs) and expected numbers to soon rise to about 100, including some ministers.

“I have been struck by the dozens of Tory MPs who would vote to quit the EU now and who will not settle for anything less than fundamental change,” Baker, who is chairing the CfB group in Parliament, wrote in the Sunday Telegraph.

The group said that it would set out details of exactly what changes it wanted at a later date, but highlighted freedom-of-movement rules and repatriating control over lawmaking powers from Brussels as likely priorities.

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